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Unbalanced and incomplete chemical equat...

Unbalanced and incomplete chemical equations are given. Complete the equation. Also balance the equations.
i) ` Zn + HCl rarr (a) + H_2`
ii) `Al + (b) rarr Al_2O_3`.

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i) a -.ZnCl_2., . Zn + 2HCl rarr ZnCl_2 +H_2.
ii) b - .O_2., . 4Al + 3O_2 rarr 2Al_2O_3.
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